Apparatus for attaching slide fastener locking members to flexible tapes



June 9 A. SUSSKIND 3, 4

APPARATUS FOR ATTACHING SLIDE FASTENER LOCKING MEMBERS TO FLEXIBLE TAPES Filed April 29, 1938 Mia/"new? Patented June 4, 1940 manna LOOKIN 'mras APPARATUS FOR- ATTAUHING SLIDE FAS- MEMIBERS TO FLEXIBLE Albert Siisskind, Berlin-Wilmersdori', stra Application April 29, 1938, Serial No. 205,103

In Germany April 30, 1937 Claims.

The invention is directed to improvements of slider fasteners. More particularly, the invention relates to a machine for producing locking members for so-called' invisible slider fasteners.

I This is the type of. slider fasteners of which the locking members are invisible from outside so that the pair of adjoining flexible tapes appear to be sewn together. Each of these locking members is clamped round the known bulbed edge of flexible tapes in such a way as to completely embrace this bulbed edge.

-According to the invention, it is possible to attach the locking members, when being formed from a metal blank, to the longitudinally moved flexible tape. But the operation can also be eflected in such a manner that, after having attached a desired number of locking members, for example flfty, the machine stopsand only the flexible tape moves on along a predetermined U distance. Then the machines operates as before until another row of a predetermined number of locking members has been attached; then the flexible tape moves on separately so that parts of the flexible tape without looking members al- U ternate with parts of the flexible tape having locking members attached thereto.

However, the locking members may also be produced separately in b the desired shape according to the invention and may then be at- 80 tached to the flexible tape. According to the invention, it is important that one end of each locking member is bent round the bulbed edge of the flexible tape so as to embrace the latter by more than 180, no additional holding means 85 being providedon the outer side.

in the accompanying drawing, several embodiments of the invention are illustrated by way of example, which are also described in the description, but it will be understood that the description and the illustrations are merely for the purposes of explanation and that various other forms are possible within the scope of the invention.

In the drawing:

Fig. 1 is a view with partial section through the guiding or shaping block forproducing the locking members from wire or flat material with the clamping arrangement,

Fig. 2 is a side view of the device, whereas Figs. 3 and 4 are views of details.

According to the embodiment illustrated in Figs. 1 to 4, a continuous wire or flat strip l passes through the block 2. As will be seen from Fig. 2, a stamping die 3 and a cutting die 4 are arranged in this block. The stamping die 3 stamps the projection or therecess 5 in the foremost piece of wire, which is cut oil by the cutting die 4. 'The abutment for clamping this piece of wire with its lower end round the bulbed edge of the flexible tape is formed by the- 6 face area 6 of the block 2. The flexible tape 1 being provided with the bulbed edge 8, round which the locking member I is to be clamped. is guided by a lever under the action of a spring and tensioned at a certain distance from the block, as shown in Fig. 1. Just before the n free end of the section I is clamped round the bulbed edge 8 of the flexible tape 1, the lever Smoves towards the block into the position shown by dotted lines in Fig. 1 so as to press the bulbed edge 8 of the flexible tape 1 against the side of the section I. At the bottom of'the' block 2 on a bracket Hi there is a pressing jaw which is oscillatable about the pivot It. It has a circular, shape i3 corresponding with the flnal shape of the bent locking member. When the flexible tape is inthe position shown by dotted lines in Fig. 1 owing to the moving of thelever 9, the jaw I l is liftedand bends the lower end of the section I, which forms the clamping portion, round the bulbed edge 8 of the flexible tape I in the position also shown by dotted lines in Fig. 1. Now, the jaw ll swings back and the lever 9 returns to its initial position shown in continuous lines in Fig. 1. The flexible tape is thereby moved back from its position shown in Fig. 1, at the same time drawing out the portion of the attached locking member sticking in the block, the flexible tape with the attached looking member now being shifted by one space.

The order of the described operationscan be arranged as desired. The driving meansare not illustrated or described, as their construction and application is known.

Fig. 3 shows a special bifurcated form of the grip of the lever,9 having an'end portion 9" for completely embracing the bulbed edge 8.

Fig. 4 shows a special form of the lever B with two arms 9' and 9". e arm 9 has a width somewhat smaller than the distance between the locking members I whereas the arm 9" can be of any desired width. The thickness of the lever 9 must be smaller than that of the locking member I so that the jaw II can press the locking members round the bulbed edge 8 of the flexible tape 1, without knocking against the arms 9' and S".

While the invention has been described with reference to specific structural details it will be appreciated that changes may be made therein by those skilled in the art. Such changes may "be made without departing from the spirit and scopeoithe invention as set. forth in the appended claims.

What I claim is: 1.'In amachine for .attaching metal locking members'to the bulbed edge of a flexible tape or stringer to form slider fasteners, a guidingand shaping block for producing locking members.

from strip metal of a suitable cross section, 'a rocking arm for holding said stringer at intervalsin position in said block, -a pivotable jaw adapted for bending the projecting end of said strip metal round said bulbed edge, means .for shaping the locking member produced from said. strip metal, and means 'for cutting-off the shaped locking member from said strip metal.

'2. In a-machine'for attaching metal locking members to the bulbed edge of a flexible tape or stringer'to Iform slider fasteners, a guiding and shaping block forproducing locking members .i'rom strip-metal of a'suitable cross section, the

block having a passage for the strip metal as well as'transverse passages, a rocking arm for holding said stringer at intervals in position in said block, a pivotable jaw for bending the projecting endof saidstripmetal round said bulbed edge, means movable in one of said transverse passages for-shaping the locking member produced'fro'msaid strip metal, and means for cutting off the shapedlocking member from said strip-metal.

3.In,-a machine for :attachingmetal locking 4 members to the bulbed edge of a flexible tape well as transverse. passages, the passage forthe strip metal leading into a recess in the block,

a rocking arm for holding said stringer at intervals in position in said block, a piv'otable jaw for bending the projecting en'd'of said strip meta1 round said bulbededge, means movable in one of said transverse passages for shaping the look ing member produced from said strip metal, and meansmovable in another of said transverse passages for" cutting off the shaped locking member froms'aid "strip metal. I r

4. In a machine for attaching metal locking members to thebulbed edge of a flexible tape or stringer to form slider fasteners, a guiding and shaping block for producing-locking members from' strip 'metalof a suitable cross section, a-rocking farm 'for holding said'stringer at intervals in position in said block, said rocking .arm having a return spring, a pivotable jaw for bending the projecting 'end of said strip metal round said bulbed edge, means for shaping the locking membe'r produced from said strip metal, and means forcutting off the shaped locking member from said strip metal.

'5. In a machine jfor attaching metal lockin members to the 'bulbed'edge of a'flexible tape or stringer to formslider fasteners, a guiding and shaping block for producing locking members from strip metal of asuitable cross section, a rocking arm for holdingsaid stringer at'inter- .vals in position in'said block, and said rocking aim being bifurcated to embrace the bulbed edge of said stringer, a pivotable jaw for bending the projecting end of said strip metal round said bulbed edge, means for shaping the locking mam ber produced from said strip metal, and means for cutting off the shaped locking member from said strip metal. v

6. In a machine for'attaching'metal locking members-to the bulbed edge of a flexible tape or stringer to form slider fasteners, a guiding and shaping block for producing locking members from strip metal of a suitable I-cro ss section, a rocking arm for holding said stringer at intervals in position in said block, a jaw for bending the projecting end of said strip metal round said bulbed edge, a bracket carried by said block,

, said jaw being pivotably supported by said bracket to cooperate with said guiding and shaping block, means for shaping the locking member produced from saidstrip metal, and means for cutting off the shaped locking member from said 1 strip metal.

'7. In a machine for attaching metal locking members to the bulbed edge of a flexibletape or stringer to form slider fasteners, a guiding and shaping block for producing locking mem bers from strip metal of a suitable cross sec tion, a rocking arm for holding said stringer at intervals in position in said block, a pivotable jaw for bending the projecting end of said strip metal round said-bulbededgeand embracing said bulbed edge by'.-more than means for shaping the locking member produced from said strip metal, and means for cutting off the shaped looking member from said strip metal.

8. In a machine for attaching metal locking members to the bulbed edge of a flexible tapev or stringer to form slider fasteners, a guidingandshaping block for producing locking members from strip metal of a suitable, cross section, a rocking arm for; holding said stringer at intervals in position in said block, a pivotable jaw forbending the projecting end of said strip met. a1 round said bulbed edge, means, for shaping the locking .member produced from said strip metal, said shaping means stamping a recess in one side of the strip metal and a projection on the other side, and means for cutting off the shaped locking member-from said strip metal.

9. In a machine for attaching metal locking members to the bulbed edge of a flexible tape or stringer to form slider fasteners,- a guiding and shaping block for producing locking members from strip metal ,of a suitable cross section, a rocking armior holding said stringer at intervals in position in said block, a pivotable jaw for bending the projecting end of said strip metal round said bulbed edge, means for shaping the locking member produced from said strip metal, said shaping means stamping a recess in one side of the strip metal and a projection on the other: side and partly wideningthe locking member, and means for cutting off the shaped locking member from said strip metal.

10. In a machine for attaching metal locking members to the bulbed edge of a flexible tape or stringer to form slider fasteners, a guiding and shaping block for producing locking mem bers from strip metal of a suitable cross section, a rocking arm for holding said stringer at intervals in position in said block, a pivotable jaw for bending the projecting end of said strip metal round said bulbed edge, means for shaping the locking member produced from said strip metal, means for cutting off the shaped locking member from said .strip metal, and said cutting means effecting a 'cut of a predetermined shape.

ALBERT SUSSKIND. 

